2004 G3500 Box Truck 274k Service
Posted: Fri May 16, 2025 8:55 am
Shipping the truck to VT to hopefully stay there a while Sunday night. FIgured I'd get the apparently-almost-annual oil change done at 3100 miles since it looked a touch dark.
I think I added only 1 qt above the "6" we argued about last time (I think 5.7 or 5.8 qts technically?), it was about 1/4-1/3 of range, so probably 1 quart to 1500-2000 miles of consumption is my guess. Doesn't seem bad especially with the towing and loaded hill climbing service it's seen.
Only notable item so far is a weeping transmission output seal. I put a new seal in while I had the trans out. I wonder if I either have a crusty driveshaft OD or a wearing-out tailshaft bearing. Internet seems to say it's a "live" lubricated output bearing, so I'm not sure how much unpressurized slop there should be.
I think I'll run it for now and see if gets worse as long as the trans stays relatively full.
5 quarts of Supertech 5W30 high mileage full synthetic, 1 qt Mobil 1 5W30 high mileage full syn, and an AC Delco PF46E.
I think I added only 1 qt above the "6" we argued about last time (I think 5.7 or 5.8 qts technically?), it was about 1/4-1/3 of range, so probably 1 quart to 1500-2000 miles of consumption is my guess. Doesn't seem bad especially with the towing and loaded hill climbing service it's seen.
Only notable item so far is a weeping transmission output seal. I put a new seal in while I had the trans out. I wonder if I either have a crusty driveshaft OD or a wearing-out tailshaft bearing. Internet seems to say it's a "live" lubricated output bearing, so I'm not sure how much unpressurized slop there should be.
I think I'll run it for now and see if gets worse as long as the trans stays relatively full.
5 quarts of Supertech 5W30 high mileage full synthetic, 1 qt Mobil 1 5W30 high mileage full syn, and an AC Delco PF46E.